Thankyou so much Dav, that's fascinating so much information, I really appreciate your time and effort spend on this for me.

I am Sorry for my late reply. A half faulty hinge on my laptop that I should of got mended months ago, blew my laptop. Which in turn then couldn't be mended. Happily I have now got a new one. (lesson)-Next time I'll mend the few quid fault. Anyway thanks to you I'm back on track thank you. Lorraine